1 files changed, 48 insertions, 0 deletions
diff --git a/source/sw_block.h b/source/sw_block.h
new file mode 100644
index 0000000..98f5211
--- /dev/null
+++ b/source/sw_block.h
@@ -0,0 +1,48 @@
+#define BLOCK_SIZE	( 1 << BLOCK_SHIFT )
+
+void BLOCK_FUNC( void ){
+	int				v, i, b, lightstep, lighttemp, light;
+	byte	pix, *psource, *prowdest;
+
+	psource = pbasesource;
+	prowdest = prowdestbase;
+
+	for (v=0 ; v<r_numvblocks ; v++)
+	{
+	// FIXME: make these locals?
+	// FIXME: use delta rather than both right and left, like ASM?
+		lightleft = r_lightptr[0];
+		lightright = r_lightptr[1];
+		r_lightptr += r_lightwidth;
+		lightleftstep = (r_lightptr[0] - lightleft) >> BLOCK_SHIFT;
+		lightrightstep = (r_lightptr[1] - lightright) >> BLOCK_SHIFT;
+
+		for (i=0 ; i<BLOCK_SIZE ; i++)
+		{
+			lighttemp = lightleft - lightright;
+			lightstep = lighttemp >> BLOCK_SHIFT;
+
+			light = lightright;
+
+			for (b=BLOCK_SIZE-1; b>=0; b--)
+			{
+				pix = psource[b];
+				prowdest[b] = ((unsigned char *)vid.colormap)
+						[(light & 0xFF00) + pix];
+				light += lightstep;
+			}
+	
+			psource += sourcetstep;
+			lightright += lightrightstep;
+			lightleft += lightleftstep;
+			prowdest += surfrowbytes;
+		}
+
+		if (psource >= r_sourcemax)
+			psource -= r_stepback;
+	}
+}
+
+#undef BLOCK_FUNC
+#undef BLOCK_SIZE
+#undef BLOCK_SHIFT